They already took it down after it stopped working (I never got the key myself). However, you can get it as well as two more Sparkle games, and 23 more games besides for just $1 at Bundle Stars for the next four weeks:

Indiegala has changed again. Another space one: Go Mission Space Travel..A bottom scroll space shoot'em up- similar to the Very Old Space Invader from pinball machine days...The Sparkle went down on me as well - was a short giveaway period of time.

There are several Steam games available for free via Simplo. To get a Steam key for Vitatio 2 (see list below) you first need to go HERE, then follow the steps. Step 1 then sign into your Steam account via the Vitatio 2 page. Step 2 then give an email and name then click on the save buttons. Step 3click on next to go to the third step optional connect to Twitter. Join the lit network (Steam group) and visit the G2A site via the Buy Steam games button (you don't need to buy), refresh the Vitatio 2 page for the Steam games task to complete then fill in the reCAPTCHA - claim your Vitatio 2 key. If you think that's too much bother, but still fancy the game it's only £0.79p/$0.99. I've not bothered trying for the other games as I already have them. I'm sure the format to claim is basically the same as for Vitatio 2. good luck to those who bother.

Check Simplo for the rest of the free Steam keys. The following games are still available for free, though some keys are almost gone. You'll find the main linkHERE

The Daily Indie Games site has two free Steam key deals on at the moment. (Delenn may have already posted details, I don't have the time to check) There were 50 000 keys for the Forge of Gods: Team of Justice Pack (the main game is free to play) and 8000 keys for the Mighty Party: Battle and Toads Pack (another free to play game).

The deal was still valid Monday morning 2nd May 2017. Hurry before all the keys are gone. you have to do the usual like certain things, subscribe to a you tube channel and visit various pages to get the free Steam key.

I think both of these dlc packs have been given away via the gamegiveawayoftheday project previously.

This was a nice day for freebies- got all three mentioned (here and two other posts) when I spotted them on the GameDeals reddit. Whether or not I actually get around to playing them is another story...